body {
	margin: 0 auto;
	overflow: hidden;
}

/*=============第一页=============*/
.header {
	margin: 0 auto;
	width: 100%;
	height: 640px;
	background-color: #000;
	position: relative;
}

.header canvas {
	width: 100%;
	height: auto
		/*默认全屏显示 可自己设置高度640px*/
	;
	display: inline-block;
	vertical-align: baseline position:absolute;
	z-index: -1;
}

.header .canvaszz {
	/*用来解决视频右键菜单，用于视频上面的遮罩层*/
	width: 100%;
	background-image: url(img/in_top_bj.jpg);
	height: 640px;
	position: absolute;
	z-index: 10;
	filter: alpha(opacity=40);
	-moz-opacity: 0.4;
	-khtml-opacity: 0.4;
	opacity: 0.4;
}

.audio {
	/*设置音乐显示位置*/
	width: 45px;
	position: fixed;
	top: 65px;
	left: 94%;
	z-index: 100;
	filter: alpha(opacity=30);
	-moz-opacity: 0.3;
	-khtml-opacity: 0.3;
	opacity: 0.3;
}

.header .top_logo {
	background-image: url(img/top_logo.png);
	margin: 0 auto;
	width: 750px;
	height: 200px;
	position: absolute;
	z-index: 30;
	top: 10px;
	left: 50%;
	margin-left: -390px;
}

.header .nav {
	width: 804px;
	height: auto;
	position: absolute;
	z-index: 30;
	top: 420px;
	left: 50%;
	margin-left: -400px;
}

.header .nav a.gv {
	text-decoration: none;
	background: url(img/nav_gv.png) repeat 0px 0px;
	width: 130px;
	height: 43px;
	display: block;
	text-align: center;
	/*水平居中*/
	line-height: 43px;
	/*上下居中*/
	cursor: pointer;
	float: left;
	/*左浮动*/
	margin: 8px 2px 8px 2px;
	font: 18px/43px 'microsoft yahei';
	color: #066197;
}

.header .nav a.gv span {
	display: none;

}

.header .nav a.gv:hover {
	background: url(img/nav_gv.png) repeat 0px -43px;
	color: #1d7eb8;
	-webkit-box-shadow: 0 0 6px #1d7eb8;
	transition-duration: 0.5s;
}

.header .topcn {
	width: 980px;
	top: 200px;
	left: 50%;
	margin-left: -490px;
	position: absolute;
	z-index: 20;

}